SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b130c86d2adfe6ec66c4e0c0928331595f50c20cdfdafa94dfaa15b3959d5345' 
  AND token = '/aVEt0hRL7VqHkCvfZ3CE0bKXb2JJG4/5rZBz7TIKBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}